.headnav {
  position: fixed;
  top: 45px;
  width: 100%;
  left: 0;
  z-index: 2;
  display: flex;
  align-items: center;
  justify-content: center;
  height: 43px;
  background: #fff;
  a {
    width: 25%;
    height: 100%;
    text-align: center;
    color: #000;
    line-height: 43px;
    font-size: 16px;
    &.active {
      font-size: 16px;
      color: #26a2ff;
      border-bottom: 3px solid #26a2ff;
    }
  }
}